The backboard is firm and durable, has high versatility, and is suitable for schools, industrial and mineral sports and mass activity.

该篮板坚固耐用、通用性强，适用于学校、工矿体育运动和群众活动中使用。

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Today we are witnessing a sixth mass extinction, but unlike the others, the current loss of bio-diversity can be traced to human activity.

今天，我们正在见证第六次物种大灭绝，但与其它几次不同的是，目前生物多样性的丧失可以追溯到人类活动。

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It's this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.

马萨诸塞州塞勒姆大学的运动科学助理教授贾克琳·诺伯格说，正是这种奇特的形式使竞走成为一项有吸引力的活动。

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Most trading businesses in Europe have tended to gravitate to London, with its critical mass of activity and expertise, and they will continue to do so.

ECONOMIST: Who benefits from a one-off levy on bankers�� bonuses?

For about a century now, tree planting has been the mass-participation activity.

BBC: NEWS | Science/Nature | Rolling back Iceland's big desert

The pollution has turned so bad that more than 100 Utah doctors called Wednesday on authorities to immediately lower highway speed limits, curb industrial activity and make mass transit free for the rest of winter.

NPR: Sickening Fog Settles Over Salt Lake City Area